Dental apparatus



May 10, 1932. .1. c. SCHWARTZ DENTAL APPARATUS Filed Jan. 30, 1930 I Ina-1m .Jhcos C. SQHHRTZJE'Q, B MERCANTILE- canmskcs BANK A D 779057 6- TRUSTEE.

7"7ORNEY Patented May 10, 1932 7 UN PATENT sc-HWA r- E AS T mvrs mx T-B 25 0 13 BY,

MERCANTIljE-GQMMERCE BANK Ann rlwsr conrnnY, 'rrwsrn'n, or s1. penis, ivrrssonnr, nssrsnon ro BERRY nnnrA LnBonAToRY co;, orvs'r. otus, nrssouar,

A coaronnrron or ivrrssouar DENTAL PPARA US,

Applicationifil ed January 30, 19,30. Serial l q/424, 12.

This invention relates generally to dental ppara us ch mor Pa t c r y; o a w n. new an ul imp o emen in d n devices for teeth.

Such plug-devices are molded in a single piece from a malleable metal, suchas lead, for subsequent compress on about or around a model of the, tooth, as more particularly described in Patent No. 1,052,850, of February ll, l913, to, which reference is made.

'Heretofore, said plug-devices have been constructed in individual molds, such production being more or less uneconomlcal in waste of time and labor and resulting in plugs of non uniform dimensions, I a

The principal objects of the present invens tion are to simplify the production andto. reduce the time involved in and cost of making such plug-devices; to provide such plug devices of uniform dimensions andsymmetry; and in general to advance the art of molding dental-appliances of the character set forth.

And with the above and other objects in view, the invention resides in the novel features of form, construction, arrangement, and combination of parts hereinafter described and pointed out in the claims.

In theaccompanyingdrawings,- 7, m

Figure 1 is a side elevational view of a plug-device forshaping gold crowns to teeth;

Figure 2 is a top plan view of the plugdevice;

Figure 3 is a perspective View of a molding device embodying the preferred form of the invention adapted for forming the plug devices of Figures 1 and 2;

Figure 4 is a top plan View. of the molding device;

Figure 5' is a sectional view through the multiple-compartment cavity of the mold taken approximately along the line 5 5, Fi ure 4; 1

*igure 6 is aside view of one of the confronting faces of the molding" device, taken approximately along the line6 6, Flgure 5; and

Figure? is a side elevational view of the fully expanded jaws of the molding device,

plugs for shapinggold crowns to,

showing the. cavity-forming. recesses the meeting'facesof the, mold- Referring now m r indeta il and by reforence characters to the drawings,first there willbe briefly describedfthe plug device for shaping gold-crowns to teeth, as ill- 1s; trated in Figures 1 and 2, reference being had to said Patent No 1,052,850, for a morefparticular description of the vpurposes and uses thereof, the present invention having'to do especially with certain perfections improvements in the construction of said lugdevice, 'aswill from time to time be pomted out as the description"proceeds. i I

The plug A, for thepurposes of thisinvention, comprises preferably a body Ofmalleable metal, suchas lead, to be molded in semi-cylindrical opposing halves l, 1, units ed integrally at ail-fend, as 2, the opposing faces of said halves having depressions 3, 3,

in registering relation to, form a preferably axial opening forthe reception of a toothmodel with a crown fitted therein (not shown), one end of said opening 3, '3 being? The present invention is directed to a molding device B for forming a plurality'of plugs A, the mold Bincluding a pair of oblongsrectangular companion body-members or blocks 5, 5, hinged together at an end, as by co-operating pairs of hinge. arms 6., 6, pivotal ly interconnected by a pintle-pin for swingable actuation of the body inembers 5, 5 from closed or opposed position,as shown in Figure 3, to open or expanded position, as in Figure 7. d

Each of the mold-members 5 is longitudinally provided upon its inner face '8 withv a plurality or series of cavity forming recesses 9a, each opening to one side of the mold; member, the recesses 94; of onememherfi being adapted, when the mold-members 5;"are in closed position, to oppiosingly register with th p cti ece se in the ee feetins face 8 of the other or' eompanionmold-merrn her 5 in the formation of mold-cavities 9 corresponding in contour with the described contour of the finished plugs A, the upper part of each of the recesses 9a, 9a, being preferably semi-cylindrical and the lower part tapering inwardly toward the bottom thereof, where the final cavity 9 is rounded, as shown in Figures 5 and6. In the production of the plugs 5,; each cavity 9 is divided vertically into two compartments 10, 10, asshown in Figure 6, said respective compartments 10, 10, preferably, though not necessarily, extending crosswise of the meeting faces 8, 8, of the mold B.

For such purpose, there is provided a removable core-piece C, which includes a blade 11 rigidly fixed or secured in a slot 12, providedin an end of amandrel 13, saidend of the mandrel 13 preferably terminating within a short distance of the lower edge of the blade or plate 11,"the slot 12 being preferably arranged to extend longitudinally through the axis of the mandrel 13, so that the two parts 7 of the latter that embrace the blade 11 serve the'purpose of a core for forming the opening 8+3 in the plug-device A, the blade 11, it will be seen, extending vertically transversely of the cavity 9 for partially parting the plug A thereat. In such respect, the mandrel 13 is preferably located centrally ofthe blade 11 in such manner that, when the latter is inserte d into its proper position in the mold-cavity 9' for partition thereof, the axis of the mandrel"13 will coincide substantially with the axis of said cavity 9, as best seen in Figure 4. The blade 11 is formed with a configuration that'is substantially the same as the vertical sectional configuration of the conjoined pair of recesses 9a, in such respect that, when the blade is inserted into its proper position in the mold B, the side and lower edges of the blade 11 fit closely to'the sides and bottom of the mold-cavity 9, whereby the two compartments 10, 10, into which the cavity 9 is divided by the blade 11, are separated from f each other without any communication except through a notch or cut-away portion 15 in the rounded or lower edge of the blade 11, said notch 15' being preferably located below. the lower end of themandrel 13, Figure 5. Preferably the other end of the mandrel 13 is provided with a protruding handle 16 for manipulation of the core-piece C, as soon appearing.

It may here be stated that the core-piece C corresponds in a certain degree to a likemember described in said Patent No. 1,052,850. The present invention, however, provides unique means for supporting or holding the core-piece C in proper position in the mold B and also for forming a finished upper surface on the several plugs A. For such several purposes, the mold-members 5,5, are each provided with a separable complementary oblong rectangular cover plate 17, detachably-secured fiatwise to the moldmember 5 by suitable fastening means 18, 18,

the pair of plates 17, 17, being adapted for meeting engagement on closure of the mold B for providing a top wall for the mold cavities to define and in such manner form a finished top surface on the several plugs A, as soonappearingf The top surface of each cover-plate 17 declines toward the inner or meeting faces 19, 19, of the pair, the plates which the pairs of notches 2O are axially disposed with respect to the mold cavities 9, 9, thereunder, so that, when conjoined, on closure of'the mold B, the respective pairs of co-operating notches 20, 20, are adapted to,

receive, for lateral supporting or positioning engagement therewith, the respective mandrels 13 upstanding from the mold-body B,

as will be understood, when the core-pieces C are suitably positioned therein.

In like manner, the respective pairs of notches 21 form pouring gates communicating with one of the chambers 10 in each cavity and, in such respect, it may be pointed out thatthe cavities 9 are preferably arranged for gating'in pairs, the pouring gates 2121 of each pair beingadjacent to one another and joined by a runner 23 formed by suitable beveled portions of the meeting faces 19, 19, of the mating cover-plates 17, 17. In a similar manner, the respective pairs of notches 22 provide vents or ports communieating with the other one of the chambers 10 in each of the mold-cavities 9, said vents 2222 being diametrically opposite the pouring -gates 21-721.

' resented from the free or front'endspf each of the companion mold-jaws 5, 5, is a somewhat springable handle or rod24, said pair of handles 24, 24, constituting a manually operable means-for swingingly actuating the mold-members 5, 5, into open or closed position, the handles 24 and the conjoined jaws 1 5,5, being releasably held in closed or molding relation by preferably a suitablemechanical means, suchas a-ring 25 slipped over'the projected pair of ends of thehandles 24 when the same are yieldingly pressed together for such purpose. i

The use of the molding device is thought to be obvious from the foregoing description, but it may be said that, the mold B being in its expanded or opened position, the corepieces C are properly inserted into the respective cavities 9 and the mold B tensionally closed as described. The mold is now ready forthe casting operation, for which purpose a low fusing malleable metal, preferably lead, in a molten state is poured into the runners 23, 23, and flows thencethrough the opposite pouring-gates 21, 21, into the subjoined respective chambers 10.

The molten lead not only fills the particular compartment 10 into which it is run, but, also, at the same time, runs through the notch 15 in the lower edge of the blade 11 into the other compartment 10, the latter being vented through the ports 22-22 aforesaid. In such manner, the molten lead will fill both compartments 10, 10, to the underside of the coverplates 17, 17, and in such respect it will be understood that the molten metal willstand in the gate 2121 and vent 22-22 forming risers for accommodating the shrinkage of the metal and in such manner having the effect of producing a nicely finished molded article for the purposes intended. When the lead has cooled in the mold B, the latter is parted, and the plugs A and their contained core-pieces C may be readily removed, whereupon, by grasping the handles 16, the cores C may be drawn from the respective plugs A.

Thus it will be seen that the invention accomplishes its objects, more particularly in providing a closed molding-chamber for producing a plurality of uniform, symmetrical fully finished articles, and, again, in provid ing for the economical and expeditious production thereof.

It will be understood that the dimensions of the various parts of the molding device may be varied for the production of different size plugs, and that other changes and modifications in the form, construction, arrange ment, and combination of the several parts of the mold may be made and substituted for those herein shown and described without departing from the nature and principle of the invention.

The invention being thus described, what it is desired to secure by Letters Patent is:

1. A mold including, in combination, a pair of companion blocks hinged together at an end and whose inner meeting faces are provided with co-operable cavity-forming recesses for registration to form a mold-cavity, said recesses also opening upon the upper face of the respective blocks, a core-piece comprising a mandrel and a notched blade, the latter being disposed transversely within the cavity for partially parting thecasting, and a pair of co-operating marginally notched cover-plates flatwise disposed on said blocks over said recesses for meeting engagement for supportingly notchwise engaging the mandrel of the core-piece and providing a finishing upper surface for the molded matter.

2. A mold including, in combination, a pair of companion blocks hinged together at an end and whose inner meeting faces are pro vided with co-operable cavity-forming recesses for registration to form a mold-cavity,

said recesses also opening upon the upper face of the respective blocks, a core-piece comprising a mandrel and a notched blade, the latter being disposed transversely within the cavity for partially parting the casting and dividing the cavity into compartments, and

a pair of co-operating marginally notched cover-plates disposed flatwise on said blocks over said recesses for meet ng engagement for notch-wisesupportmgly engaging the mandrel of the core-piece, said cover-plates also 1 providing a finishing surface for the molded matter and being provided with additional registering notches for gating one of said compartments and venting the other.

3. A mold including, in combination, a pair of companion oblong-rectangular blocks hinged together at an end and whose inner meeting faces are provided with a longituditheirupper end and providing a finishing surface for the molded matter, said coverplates having a plurality of marginal cooperably registering notches for supportingly engaging the respective mandrels of said core-pieces and for gating and venting the respective compartments of the several cavities.

In testimony whereof, said MERCANTTLE- COMMERCE BANK & TRUST COMPANY has signed its name to this specification, by its vice-president thereunto duly authorized.

MERCANTILE COMMERCE BANK AND TRUST CO. [L. s.] Trustee for Jacob O. Schwartz, Deceased. By THOS. C. HENNINGS,

Vice Pres. 

